M peters



(No Model.) 2 SheetS-Shet 1.

M. N. FORNEY.

FURNACE DO0R.

No. 354,631. Patented Dec. 1. 1886 F'HE IE- jjmii 1 n Pmns mumm -1pmWahimnm o. c;

, (No Model.) 2Sheets-Sheet2.

M. N. PORNEY.

, FURNACE DOOR. r

No. 354,631. Patented Do. 21,1886.

\ QIIIIIIIIII v IIIIIIIIIIIIIIIIIIIIIIIIA NITED STATES PATENT FFICE.

FURNACE-DOOR.

I SPECIFICATION forming part of Letters Patent No. 354,631, datedDecember 21, 1886.

Application filed June 7, 1886. Serial No. 204,323. (No model.)

To all whom it may concern.-

Be it known that I, MATTHIAS NACE Fon- NEY,of the city, county, andState of New York, have invented certain Improvements in Fire- Box-orFurnace Doors, of which the following is a specification.

This invention relates to improved means for applying the pressure ofsteam, air, or other fluid-to furnace-doors for the purpose of openingand closing the same, as will hereinafter fully appear. In thedescription of the said invention which follows reference is made to theaccompanying drawings, forming a part hereof, and in which- Figures Iand II are, respectively, a front and an edge view of alocomotive-furnace door provided with my improvements. Fig. III is aplan of Fig. I, with a part of the front of the boiler. Figs. IV and Vare respectively a side section and a sectional plan of certain parts oftheinvention on an enlarged scale.

Inthe said drawings, A is a part of the boiler, and B the door-framesecured to the boiler in the usual manner.

0 is the furnace-door, formed in two parts or sections, denoted by a andb, hinged to the frame B. The hinges employed consist of the brackets cand d, attached, respectively, to the sections a and b of the door, thelugs e and f, on the frame B, and the bolts 9 and 71. These bolts passloosely through the lugs e and f, and are fastened to the brackets,preferably, by means of set-screws 2'. j

D and E are arms rigidly attached to the upper ends of the bolts 9 andh, and they project in opposite directions from a dotted line, x w, inFig. III, which extends through the center of the bolts 9 and h, inorder that when they are moved in the same direction the bolts 9 and hare swung around in opposite directions, and the sections a and b of thedoor 0 are jointly opened or closed. The arms D and Bare coupledtogether by means of an offset-bar, F, to the middle of which is pivotedthe piston-rod G of a steam-cylinder, H, hereinafter described.

As the ends of the coupling-bar F move in arcs of circlescurvedin'opposite directions,

the path of the middle point of the bar is a straight line, thereforethe piston-rod Gcan be connected directly to the bar at this point armsare rigidly attached.

without the intervention of guides or connecting-rods to maintain therectilineal movement of the end of the rod. v

H is a stop to arrest the movement of the piston when the doors areopened wide enough. The cylinder is supported in any suitable manner,but preferably from the front of the boiler, and it'is provided with apiston, k, which is at the inner end of the piston-rod G.

I is the steam-valve chest at the rear end of the cylinder H, connectedwith theinterior of the said cylinder by means of the front and rearsteam-ports, land m. The exhaust-port is denoted by n, and theexhaust-pipe leading therefrom by 0.

J is the steamyalve, which is shown as of f the piston form, adapted toslide within the valve-chest I. This valve operates to control theadmission of steam to'the cylinder in substantially the same manner asthat of a slide- Valve engine, and it is moved from a hinged foot-plate,K, by mechanism substantially as follows: The foot-plate is secured totwo arms,

12 p, on a vibratory shaft, q, supported in bearings r on the foot-boardand yieldingly sup-' ported by means of a spring, 8. L is a third arm,also attached to the shaft g, which projects in an opposite direction tothe ones 1). To the arm L is connected a rod, t, the upper end of whichis just below the bottom of the valve-chest. The valve has a projectionwhich extends downward and outside of the valvechest and bears ontheupper end of the rod it.

When the fireman desires to open the furnace-door, he depresses theplate K with his foot, when the steam-valve I is raised through themedium of the arms pp and L and the rod 15, before described, and steamis admitted to the port m, and thence to the rear end of the piston k.The piston is thusdriven forward, and its movement transmitted to thetwo sections of the furnace-door through the medium of the piston-rodG,- offset-rod F, arms D and E, and the bolts 9 and h, to which the saidIn the depression of the foot-plate the supporting-spring s is forceddown, consequently its resilient action as the foot is removed raisesthe plate K and arms 1) p and depresses the end of the arm L and rod 1.The pressure of the steam above the valve then forces it down into theposition shown in Fig. IV, which permits the steam below the piston tobe exhausted and live steam to enter the cylinder in front, which forcesthe piston back into the position shown in Fig. IV, thus closing thedoors.

It will be understood that, with some slight modifications, theinvention as described may be adapted for furnace-doors of land andmarine boilers, and to single as well as to double door, as shown; andwhile I have described the mechanism which I believe best adapted toeffect the movement of the steam-valve and transmit the motion of thesteam-piston to the doors I do not wish to be limited to the exactconstruction shown, as the said devices can be considerably changedwithout departing from the spirit of the invention.

I do not claim, broadly, the application of steam-power tofurnace-doors, as I am aware.

that doors of Inetallurgic furnaces have been lifted by means of asteam-actuated piston, the closing of the said doors being efl'ected bytheir own weight; but I am not aware that before my invention a pistonactuated by steam has been used to open and close a furnacedoor. 7 I

I therefore claim as my invention- 1. In combination with the door of aboilerfurnace, asteam-cylinder having a steamport leading to either endthereof, a valve to control the admission of steam to either of the saidports, a piston within the said cylinder having a rod united to the doorby means of suitable connections, and actuating devices, wherebymovement of the hand or foot may be applied to the steam-valve to openor close the door, substantially as and for the purpose 2. Incombination with a door-frame adapted for attachment to a boilerfurnace, a door hinged to the said frame, a steam-cylinder having asteam-port leading to either end thereof, a valve to control theadmission of steam to either of the said ports, a piston within the arecoupled together by means of a bar, a

steam-cylinder having a steam-port leading to either end thereof, asteam-valve to control the admission of steam to either of the saidports, a piston in the cylinder, having a rod connected to the saidcoupling-bar, and actuating devices, whereby movement may becommunicated to the said valve to change its position, and thereby openor close the two sec tions of the door, substantially as and for thepurpose specified.

4. In combination with a furnace-door in two hinged sections, havingarms rigidly attached to the bolts of the said hinges, which bolts arefastened to the portions of the hinges which form parts of the door, abar to unite I J, rod t, arms L and p p, supported shaft q,

and yieldingly-sustained foot-plate K, substantially as and for thepurpose specified.

MATTHIAS NAGE FORNEY. Vi tn esses RICHARD H. BUEL, WIN'rHRoP PARKER.

